Optical binding mechanisms: a conceptual model for Gaussian beam traps

Taylor, J.M. and Love, G.D. (2009) Optical binding mechanisms: a conceptual model for Gaussian beam traps. Optics Express, 17(17), pp. 15381-15389. (doi: 10.1364/OE.17.015381)

Abstract

Optical binding interactions between laser-trapped spherical microparticles are familiar in a wide range of trapping configurations. Recently it has been demonstrated that these experiments can be accurately modeled using Mie scattering or coupled dipole models. This can help confirm the physical phenomena underlying the inter-particle interactions, but does not necessarily develop a conceptual understanding of the effects that can lead to future predictions. Here we interpret results from a Mie scattering model to obtain a physical description which predict the behavior and trends for chains of trapped particles in Gaussian beam traps. In particular, it describes the non-uniform particle spacing and how it changes with the number of particles. We go further than simply demonstrating agreement, by showing that the mechanisms “hidden” within a mathematically and computationally demanding Mie scattering description can be explained in easily-understood terms.

• Item Type: Articles
• Additional Information: This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OE.17.015381. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Taylor, Dr Jonathan
• Authors: Taylor, J.M., and Love, G.D.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Optics Express
• Publisher: Optical Society of America
• ISSN: 1094-4087
• ISSN (Online): 1094-4087
• Published Online: 14 August 2009
• Copyright Holders: Copyright © 2009 Optical Society of America
• First Published: First published in Optics Express 17(17):15381-15389
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher